The invention discloses a bidirectional permanent magnetic induction flowmeter, which comprises a measuring tube, a middle axle coaxial with the measuring tube, flow guide wings and a detection device. An annular track is arranged between the middle section of the middle axle and the middle section of the measuring tube; a small magnetism-conducting ball capable of moving around the annular trackis arranged in the annular track; the detection device is arranged at a position on the outer circle of the measuring tube corresponding to the annular track; the annular track can limit the small magnetism-conducting ball to transversely move leftwards and rightwards and makes fluid in the measuring tube pass through; the flow guide wings are arranged on two sides of the annular track in the measuring tube; and eddying flow generating wings capable of making the fluid rotate after passing through are arranged between the annular track and the flow guide wings. The bidirectional permanent magnetic induction flowmeter has the advantages of capability of measuring flow rate of various non magnetism-conducting low-viscosity acidic and alkali fluids, along with simple structure, high antijamming capability, low loss of pressure head, high corrosion resistance and high reaction speed.